How Important Is It to Be in First, Second, Et Et Cetera?

There is payment that companies will give to supermarkets to put products in favored positions. Companies like google, for example, pay other companies like apple to come pre installed on ephones and and eye pads. The mechanism seems to be people are very sensitive the little bit of effort it might take to kneel down. I'm reminded of a study by roluca a ursu at new york university who looked at how people picked hotel accommodations on expedia.